int main(void){
	int a,b;
	printf("Enter two numbers:");
	scanf("%d %d", &a, &b);
	printf("add:%d\n",add(a,b));
	printf("sub:%d\n",sub(a,b));
	printf("mul:%d\n",mul(a,b));
	printf("div:%lf\n",div(a,b));
	return 0;
}
//20175211
